Don’t make it complicated. Sure it’s fun to use different colored ink pens and markers for each type of event or action item, but this will get old very quickly. You’re spending all your time on busy work instead of getting your to do lists done. In a perfect world, everything in my calendar is color coordinated, crossed off when done, and decorated with pretty washi tape. In real life? Scribbles in whatever color ink pen the kids haven’t made off with.